Update python-package.yml

Author: hsz1273327

.github/workflows/python-package.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: [3.8, 3.9, 3.10]
 
     steps:
       - uses: actions/checkout@v2
@@ -32,6 +32,9 @@ jobs:
       - name: Lint with pep8
         run: |
           pycodestyle --max-line-length=140 --ignore=E501 --first --statistics postgresql_kernel
+      - name: Perpare for static check
+        run: |
+          mypy --install-types
       - name: Static check with mypy
         run: |
           mypy --ignore-missing-imports --show-column-numbers --follow-imports=silent --check-untyped-defs --disallow-untyped-defs --no-implicit-optional --warn-unused-ignores --scripts-are-modules postgresql_kernel